FeOOH纳米粒子协同聚偏氟乙烯电纺纤维膜插层增强碳纤维复合材料层间断裂韧性

Enhancing interlaminar fracture toughness of carbon fiber composite with interleaved polyvinylidene fluoride electrospun fiber veils cooperating FeOOH nanoparticles

为有效增强碳纤维/环氧树脂复合材料层压板(CF/EP)的层间断裂韧性,提出了一种纳米粒子协同纳米纤维膜插层改性方法。首先利用喷涂法将针状羟基氧化铁(FeOOH)纳米粒子均匀负载于碳纤维布表面,然后将制得的静电纺丝聚偏氟乙烯纳米纤维膜(PVDF)插入碳纤维布的层间,采用手工铺设-真空热压法制备了改性复合材料层压板PVDF&FeOOH-CF/EP,研究了不同面密度的FeOOH协同PVDF增强CF/EP层间断裂韧性的作用效果及增强机制。结果表明,FeOOH在碳纤维布上分布均匀,在面密度为2 g/m^(2)时,PVDF&FeOOH-CF/EP层压板获得了最佳的增韧效果,相对于CF/EP,其I型层间断裂韧性G_(IC)提高了118%,II型层间断裂韧性G_(IIC)提高了97%,而PVDF-CF/EP的G_(IC)和G_(IIC)只分别提高了70%和44%。SEM分析显示,FeOOH的加入不仅提高了基体的断裂韧性,同时也增强了PVDF纤维与基体的界面作用,进而强化了PVDF的增韧行为。

For effectively enhancing the interlaminar fracture toughness of carbon fiber epoxy resin composite laminates(CF/EP),a modification method of nanofiber veils intercalation cooperating nanoparticles was proposed.First,the needle-like FeOOH nanoparticles were uniformly loaded on the surface of the carbon fiber cloth by spraying method,and then the prepared electrospun polyvinylidene fluoride(PVDF)nanofiber veils was interleaved between the layers of the FeOOH loaded carbon fiber cloth,and the modified composite laminate PVDF&FeOOHCF/EP was prepared by manual laying-vacuum hot pressing method,and the effective effect and mechanism of FeOOH with different areal densities in enhancing the interlaminar fracture toughness of CF/EP with the PVDF were studied.The results show that FeOOH is evenly distributed on the carbon fiber cloth.When the areal density is 2 g/m^(2),the PVDF&FeOOH-CF/EP laminate has the best toughening effect.Compared with that of CF/EP,the mode-I interlaminar fracture toughness G_(IC) is increased by 118%and mode-II interlaminar fracture toughness G_(IIC) is increased by 97%,while the G_(IC) and G_(IIC) of PVDF-CF/EP only are increased by 70%and 44%,respectively.SEM analysis shows that the addition of FeOOH not only improves the fracture toughness of the matrix,but also enhances the interface between the PVDF fiber and the matrix epoxy resin,thereby enhancing the toughening behavior of PVDF fiber.